#include "ManagedBlasProvider.h"

 /* Subroutine */int SmartMathLibrary::Blas::Engine::ManagedBlasProvider::drotg_
   (doublereal *da, doublereal *db, doublereal *c__, doublereal *s)
{
  /* Table of constant values */
  static doublereal c_b4 = 1.;

  /* System generated locals */
  doublereal d__1, d__2;
  /* Builtin functions */
  double d_sign(doublereal *, doublereal*);
  /* Local variables */
  static doublereal r__, z__, roe, scale;
  /*  Purpose   
  =======   
  construct givens plane rotation.   
  jack dongarra, linpack, 3/11/78. */
  roe =  *db;
  if (abs(*da) > abs(*db))
  {
    roe =  *da;
  }
  scale = abs(*da) + abs(*db);
  if (scale != 0.)
  {
    goto L10;
  }
  *c__ = 1.;
  *s = 0.;
  r__ = 0.;
  z__ = 0.;
  goto L20;
  L10: 
  /* Computing 2nd power */
  d__1 =  *da / scale;
  /* Computing 2nd power */
  d__2 =  *db / scale;
  r__ = scale * System::Math::Sqrt(d__1 *d__1 + d__2 * d__2);
  r__ = d_sign(&c_b4, &roe) *r__;
  *c__ =  *da / r__;
  *s =  *db / r__;
  z__ = 1.;
  if (abs(*da) > abs(*db))
  {
    z__ =  *s;
  }
  if (abs(*db) >= abs(*da) &&  *c__ != 0.)
  {
    z__ = 1. /  *c__;
  }
  L20: *da = r__;
  *db = z__;
  return 0;
} /* drotg_ */
